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Well, have taken delivery of various 9000 components here in the UK, but still need the as-yet-unavailable 12-28 cassette and brakes before I can finish building the bike.

Anyway, does anyone have the definitive answer on backwards compatibility of the chainset with earlier HollowTech II bottom brackets? Various reviewing websites have commented on the fact that the new one is still HollowTech II, but with some changes in design and dimensions, and giving no indications as to whether they are effectively interchangeable.

FairWheel Bikes had this to say:The spindle remains the same 24mm diameter while the bottom bracket itself gets smaller. The cup shrinks but will come with a plastic sleeve that increases its outer diameter during installation so that existing Shimano BB tools will work with it.

RoadCC:You’ll be pleased to know that Shimano haven’t come up with a new bottom bracket standard although they have reduced the size of the bearing they use to save a little weight. The cup diameter is also reduced so you need to use a special tool when fitting, and Shimano say they've improved the sealing. The 9000 Series will come in a standard external version and in a press-fit option.

So, has anyone used a non-Shimano, or a 7900/7800, bottom bracket with the new Dura Ace 9000 chainset? If so, did it just fit as normal? Presumably the critical factors are the length and diameter of the chainset spindle - we know it remains 24mm in diameter, but is it still the same length?

9000 is the Hollowtech II 24mm spindle. Our BB30/PF30 Conv BB is quickly becoming the Go-To BB for many shops getting ready to install the 9000 crank onto these frames. Rock solid. Give us a call or email if any questions!

my personal experience is consistent with all the reviews. front shifting is sublime, brakes are much improved coming from the 7900. shifters feel much better in your hand and the rear shift effort stays consistent over every cog. overall, a worthy upgrade over the 7900.

Last edited by mann2 on Sun Nov 04, 2012 12:47 pm, edited 1 time in total.

I work for a Trek dealer and noticed they had a few pieces of Dura Ace 9000 come into stock. I ordered everything I needed and should have it Friday. I also picked up the Praxis BB30 adapter to use the new Dura Ace crank. I have been on Sram for a couple of years now and anyone that has used the new 9000 says it great. Now I have to decide on wheels. I could build up some 9000 hubs with Open Pro's, also noticed Trek has the 11 sp conversion for the DT Swiss 240/180 hubs. I'll let you know when I'm done.

Coming off a 13.5 lb SuperSix I wouldn't say there's a huge difference in the frames, but the 9000 makes it feel like a different bike. The Evo Black sure is nice to look at though. I changed the seat to a Aliante, and with Speedplays and bottle cages a 60cm bike was 12.75.